Go to the ticket office at TD Garden, that will be easiest, if you try doing it on your phone/internet, things could be delayed, unless you're already using paperless ticketing. Otherwise your best option is to just go to the ticket office, good luck! Have fun at your concert!
When u go in give information with idea let them know they can print up what was lost the agent told me when i bought my wwf tickets two months ago if i lost or misplace my tickets ...
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